The invention discloses a method for extracting active 
polysaccharide-araboxylan from wheat 
bran through a compound 
solvent. The extraction method mainly comprises the following steps: the wheat 
bran is mildly hydrolyzed and preprocessed by a weak acid (
citric acid); the target 
polysaccharide is extracted through a strong alkali (KOH); the extracting solution is centrifugated, neutralized, concentrated and subjected to 
ethanol precipitation; the 
ethanol precipitate is dried to obtain the target 
polysaccharide. The centrifuged supernate of the 
ethanol precipitate is concentrated and dried, and then can be used as an agricultural compound 
fertilizer for comprehensive utilization. According to the invention, a large quantity of the byproduct resource, namely the wheat 
bran is utilized, and the compound 
solvent is designed to extract the biological active polysaccharide, namely the araboxylan. Compared with the traditional alkali method, the extraction method improves the working efficiency, and reduces the 
environmental protection pressure. Animal experiments prove that the polysaccharide has prominent immunoregulatory activity, and the effect is comparable to that of 
lentinan. According to the target polysaccharide provided in the invention, the 
raw material is low in cost and rich, and the extraction method is environment-friendly, so that the industrialization development of the polysaccharide is promising in the future.